Sunris/sunset detection.

wled00/cfg.cpp

@@ -305,6 +305,8 @@ void deserializeConfig() {
   CJSON(currentTimezone, if_ntp[F("tz")]);
   CJSON(utcOffsetSecs, if_ntp[F("offset")]);
   CJSON(useAMPM, if_ntp[F("ampm")]);
+  CJSON(longitude, if_ntp[F("ln")]);
+  CJSON(latitude, if_ntp[F("lt")]);
 
   JsonObject ol = doc[F("ol")];
   CJSON(overlayDefault ,ol[F("clock")]); // 0
@@ -620,6 +622,8 @@ void serializeConfig() {
   if_ntp[F("tz")] = currentTimezone;
   if_ntp[F("offset")] = utcOffsetSecs;
   if_ntp[F("ampm")] = useAMPM;
+  if_ntp[F("ln")] = longitude;
+  if_ntp[F("lt")] = latitude;
 
   JsonObject ol = doc.createNestedObject("ol");
   ol[F("clock")] = overlayDefault;

wled00/data/index.js

@@ -589,7 +589,7 @@ function populateInfo(i)
 ${urows}
 ${inforow("Build",i.vid)}
 ${inforow("Signal strength",i.wifi.signal +"% ("+ i.wifi.rssi, " dBm)")}
-${inforow("Uptime",getRuntimeStr(i.uptime))}
+${inforow("Uptime",getRuntimeStr(i.uptime)," <span class='icons'>"+(i.isday?"&#xe333;":"&#xe2a2;")+"</span>")}
 ${inforow("Free heap",heap," kB")}
 ${inforow("Estimated current",pwru)}
 ${inforow("Average FPS",i.leds.fps)}

wled00/data/settings_time.htm

@@ -113,7 +113,8 @@
       <option value="18">HST (Hawaii)</option>
 		</select><br>
 		UTC offset: <input name="UO" type="number" min="-65500" max="65500" required> seconds (max. 18 hours)<br>
-		Current local time is <span class="times">unknown</span>.
+		Current local time is <span class="times">unknown</span>.<br>
+		Longitude: <input name="LN" type="number" min="-180" max="180" step="0.01"> Latitude: <input name="LT" type="number" min="-90" max="90" step="0.01">
 		<h3>Clock</h3>
 		Clock Overlay:
 		<select name="OL" onchange="Cs()">

wled00/fcn_declare.h

@@ -135,6 +135,7 @@ bool checkCountdown();
 void setCountdown();
 byte weekdayMondayFirst();
 void checkTimers();
+bool isDayTime();
 
 //overlay.cpp
 void initCronixie();

wled00/html_settings.h

@@ -316,7 +316,9 @@ US-MST/MDT</option><option value="7">US-AZ</option><option value="8">US-PST/PDT
 </option><option value="17">ACST/ACDT</option><option value="18">HST (Hawaii)
 </option></select><br>UTC offset: <input name="UO" type="number" min="-65500" 
 max="65500" required> seconds (max. 18 hours)<br>Current local time is <span 
-class="times">unknown</span>.<h3>Clock</h3>Clock Overlay: <select name="OL" 
+class="times">unknown</span>.<br>Longitude: <input name="LN" type="number" 
+min="-180" max="180" step="0.01"> Latitude: <input name="LT" type="number" 
+min="-90" max="90" step="0.01"><h3>Clock</h3>Clock Overlay: <select name="OL" 
 onchange="Cs()"><option value="0" id="cn" selected="selected">None</option>
 <option value="1" id="ca">Analog Clock</option><option value="2">
 Single Digit Clock</option><option value="3" id="cc">Cronixie Clock</option>

wled00/json.cpp

@@ -509,6 +509,7 @@ void serializeInfo(JsonObject root)
   
   root[F("freeheap")] = ESP.getFreeHeap();
   root[F("uptime")] = millis()/1000 + rolloverMillis*4294967;
+  root[F("isday")] = daytime;
 
   usermods.addToJsonInfo(root);
   

wled00/ntp.cpp

@@ -263,6 +263,11 @@ void checkTimers()
 {
   if (lastTimerMinute != minute(localTime)) //only check once a new minute begins
   {
+    daytime = isDayTime();
+    if (prevDaytime != daytime) {
+      // sunrise or sunset
+      DEBUG_PRINTLN(daytime?F("Sunrise"):F("Sunset"));
+    }
     lastTimerMinute = minute(localTime);
     for (uint8_t i = 0; i < 8; i++)
     {
@@ -277,3 +282,52 @@ void checkTimers()
     }
   }
 }
+
+/*
+ * This program calculates solar positions as a function of location, date, and time.
+ * The equations are from Jean Meeus, Astronomical Algorithms, Willmann-Bell, Inc., Richmond, VA
+ * (C) 2015, David Brooks, Institute for Earth Science Research and Education.
+ * http://www.instesre.org/ArduinoUnoSolarCalculations.pdf
+ */
+//#define DEG_TO_RAD 0.01745329
+//#define PI 3.141592654
+#define TWOPI 6.28318531
+
+long JulianDate(int year, int month, int day) {
+	if (month<=2) {
+		year--; month+=12;
+	}
+	int A=year/100;
+	int B=2-A+A/4;
+	return (long)(365.25*(year + 4716)) + (int)(30.6001*(month + 1)) + day + B - 1524;
+}
+
+bool isDayTime() {
+	float JD_frac,T,L0,M,C,L_true,GrHrAngle,Obl,RA,Decl,HrAngle,elev;
+	long JD_whole,JDx;
+
+	float Lon = longitude*DEG_TO_RAD;
+	float Lat = latitude*DEG_TO_RAD;
+
+  // calculate elevation of the sun (>0 daytime, <0 nighttime)
+	JD_whole  = JulianDate(year(localTime), month(localTime), day(localTime));
+	JD_frac   = (hour(localTime) + minute(localTime)/60. + second(localTime)/3600.)/24. - .5;
+	JDx       = JD_whole - 2451545;
+	T         = (JDx + JD_frac)/36525.;
+	L0        = DEG_TO_RAD*fmod(280.46645 + 36000.76983*T, 360);
+	M         = DEG_TO_RAD*fmod(357.5291 + 35999.0503*T, 360);
+	C         = DEG_TO_RAD*((1.9146-0.004847*T)*sin(M) + (0.019993-0.000101*T)*sin(2*M) + 0.00029*sin(3*M));
+	Obl       = DEG_TO_RAD*(23 + 26/60. + 21.448/3600. - 46.815/3600*T);
+	GrHrAngle = 280.46061837 + (360*JDx)%360 + .98564736629*JDx + 360.98564736629*JD_frac;
+	GrHrAngle = fmod(GrHrAngle, 360.);
+	L_true    = fmod(C + L0, TWOPI);
+	RA        = atan2(sin(L_true)*cos(Obl), cos(L_true));
+	Decl      = asin(sin(Obl)*sin(L_true));
+	HrAngle   = DEG_TO_RAD*GrHrAngle + Lon - RA;
+
+	elev = asin(sin(Lat)*sin(Decl) + cos(Lat)*(cos(Decl)*cos(HrAngle)));
+	// Azimuth measured eastward from north.
+	// azimuth = PI+atan2(sin(HrAngle),cos(HrAngle)*sin(Lat)-tan(Decl)*cos(Lat));
+	
+	return elev > 0.; // if elevation is gt 0 then it is a day
+}

wled00/set.cpp

@@ -294,6 +294,8 @@ void handleSettingsSet(AsyncWebServerRequest *request, byte subPage)
 
     //start ntp if not already connected
     if (ntpEnabled && WLED_CONNECTED && !ntpConnected) ntpConnected = ntpUdp.begin(ntpLocalPort);
+    longitude = request->arg(F("LN")).toFloat();
+    latitude = request->arg(F("LT")).toFloat();
 
     if (request->hasArg(F("OL"))) {
       overlayDefault = request->arg(F("OL")).toInt();

wled00/wled.h

@@ -8,7 +8,7 @@
  */
 
 // version code in format yymmddb (b = daily build)
-#define VERSION 2103050
+#define VERSION 2103051
 
 //uncomment this if you have a "my_config.h" file you'd like to use
 //#define WLED_USE_MY_CONFIG
@@ -515,6 +515,10 @@ WLED_GLOBAL unsigned long ntpPacketSentTime _INIT(999000000L);
 WLED_GLOBAL IPAddress ntpServerIP;
 WLED_GLOBAL uint16_t ntpLocalPort _INIT(2390);
 WLED_GLOBAL uint16_t rolloverMillis _INIT(0);
+WLED_GLOBAL bool daytime _INIT(false);
+WLED_GLOBAL bool prevDaytime _INIT(false);
+WLED_GLOBAL float longitude _INIT(0.0);
+WLED_GLOBAL float latitude _INIT(0.0);
 
 // Temp buffer
 WLED_GLOBAL char* obuf;

wled00/xml.cpp

@@ -448,6 +448,10 @@ void getSettingsJS(byte subPage, char* dest)
     sappend('i',SET_F("TZ"),currentTimezone);
     sappend('v',SET_F("UO"),utcOffsetSecs);
     char tm[32];
+    dtostrf(longitude,5,2,tm);
+    sappends('s',SET_F("LN"),tm);
+    dtostrf(latitude,5,2,tm);
+    sappends('s',SET_F("LT"),tm);
     getTimeString(tm);
     sappends('m',SET_F("(\"times\")[0]"),tm);
     sappend('i',SET_F("OL"),overlayCurrent);